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A synopsis of surface acoustic wave propagation on {100}‐cut 〈110〉‐propagating gallium arsenide

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3 Author(s)
Hunt, W.D. ; School of Electrical Engineering and The Microelectronics Research Center, Georgia Institute of Technology, Atlanta, Georgia 30332 ; Kim, Y. ; Fliegel, F.M.

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We present the results of a series of calculations predicting surface acoustic wave (SAW) beam profile propagation in the 〈110〉 direction on {100}‐cut GaAs. These calculations utilize an experimentally verified angular spectrum of plane waves diffraction theory computer program with experimentally determined GaAs slowness surface data. These data are presented in such a way that they should be particularly useful to designers of acoustic charge transport (ACT) devices, by enabling appropriate choice of ACT channel widths for given delay line lengths and SAW transducer apertures. Further, these calculations show that ACT filters which rely on apodization to determine tap weights will suffer transfer function distortion, alternatively interpreted as reduction of dynamic range, compared to ACT filters in which charge sensing is accomplished by taps extending fully across the channel and employing tap weighting external to the channel; this problem is observed to grow in acuteness with delay line length.

Published in:

Journal of Applied Physics  (Volume:69 ,  Issue: 4 )